Petee peartree



FRIGTION PULLEY.

No. 305,842. Patented Sept. 30, 1884.

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PETER PEARTREE, OF COHOES, NEW YORK, ASSIGNOR TO ROBERT JOHNSTON, OFSAME PLACE.

FRICTION-PULLEY.

Application tiled April 9, 1884. (No model.)

To @ZZ whom it may concern:

Be it known that I, PETER PEARTREE, of Cohoes, in the county of JAlbanyand State of New York, have invented certain new and useful Improvementsin Friction-Pulleys, of which the following is a full and exactdescription, reference being had to the accompanying drawings, whichform part of this specification, and in whichv Figure 1 is a frontelevation of the pulley and fixed disk, portions of the cams beingshownin section; Fig, 2, a rear elevation of the sliding cam-plate; Fig.8, a vertical section of the pulley, fixed disk, and cam-plate; and Fig.4, an enlarged and detached detail of one of the friction-clamps.

The object of my invention is to. afford suitable facilities for quicklyengaging and disengaging a shaft and pulley when occasion requires; andI attain this object by means of the mechanism illustrated in theaccompanying drawings, and described in this specification.

As represented in the drawings, Aisa loose pully; B, the fixed disk; C,friction-clamps, D, sliding cam-plate, and E the shaft.

The pulley A is iitted upon the shaft E in such manner that it can berevolved independently of said shaft. Said pulley is prevented frommoving sidevvise by means of a collar, a, or other suitable device,which hears against the outer end of the hub of the pulley.

The dislr` B is secured to the shaft E near the inner end of the hubofthe pulley A, and in such manner that the 'annular flange or rim ofsaid pulley 'will overlap the periphery of said disk. The outer edge ofthe latter is .4o tances around its periphery,

provided with a series of openings or indentations, b, which areyspacedat uniform disand at one end of each indentation lugs b are in Fig. l.

The friction-clamps C have their outer faces convened, to lit theconcavity of the annular flange or rim of the pulley A, and, preferably,

- the outeriaces of said clamps are provided with facings c, of leatheror other suitable niaterial, for producing a close frictional contactwith the inner side of the rim of the pulley. Said clamps are pivoted tothe lugs b' by means formed, as shown of pins c', which are arrangedparallel to the shaft E, so as to swing from and toward the center ofthedisk B on a plane with the face of the latter. Said clamps are providedwith arms'cz, which project oppositelyto the clamps, 5 5 (in respect tothe pivotal centers of the latter,) and which rest upon springs c insuch manner that the power of the springs is eX- erted to force thefaces of the clamps from their contact With the rim of the pulley.

The cam-plate Dis ittedto slide on a spline, e, ofthe shaft E, so thatthe latter and the said cam-plate will always revolve together.

,Said cam-plate has a series of cams, d, which plate, and are equalproject sidevvise from said in number and position with. thefrictionclamps C. The cams (l have their outer faces formed on aninclined plane in respect to the center line of the shaft, and said camsare so arranged that cach its appropriate opening, l, beneath aclainp,C, and so that by a sliding movement in the plate 'D in the requireddirection said cams will simultaneously force all the clamps C outwardlyinto frictional contact with the inner side ofthe riin of the pulley A;but by a sliding movement of the plate l) in the opposite direction thecams d can be withdrawn, so as to permit the springs c to force theclamps (l from their contact with the pulley and effect- 8o thercleasenient of the shaft. The sleeve d or' the cam-plate is providedwith a circumferential groove, d2, for, receiving a forked lever orother suitable appliance, whereby said camplate may be slid back andforth on the shaft E as occasion may require.

By using a number of the `frietion-clainps, C, I am enabled to'distribute the frictional contact With the pulley over a greater extentof surface than can be obtained by two oppositely-arranged clamps, andthereby I obtain a greater degree of `adhesion with a 'smallerexpenditure of force.

Then required, the sleeve d nia-y be prol vided with two cam-platesD-one at each end ofsaid sleeve-so as to be optionally used for engagingwith either one of two pulleys that revolve in opposite directions.

I claim as my invention l. The loose pulleyAand adisl;,B, secured roc ofthem can be slid into 7o means of 9o to the shaft E, and provided With.a series of yl a fixedy disk provided with a series of Afriction-Kfrictional clamps, C, pivoted to said diskby'l clamps lpivoted theretoto swing on a plane pins c', arranged in lineWith the shaft E, said withthe face of said disk, and mechanisms, clamps being,1 operated in onedirection by substantially as described, for moving said springs c3, asherein described, in combination clamps, as and for the purposespecified. with a sliding cam-plate, D provided with a series ofprojecting inclined cams, d, which PETER PEARTREE. are adapted to forcethe clamps C outwardly, as and for the purpose herein specified.

2. The combination, With a loose pulley, of l Witnesses:

WALTER T. KELLOGQ WILLARD E. LAPE.

